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Theory of Multipolar Kondo Materials

Date : Wednesday, December 12th, 2018 16:00 - 17:00 Place : Seminar Room 5 (A615), 6th Floor, ISSP Lecturer : Yong-Baek Kim Affiliation : Department of Physics, University of Toronto

The standard Doniach phase diagram of Kondo materials or heavy fermion

systems often assumes Kramers-doublet local moments coupled to conduction electrons. On the other hand, there exist a class of materials, where the local moments carry multipolar moments due to their non-Kramers nature. In this talk, I will describe a theory of Kondo materials with multipolar local moments using the example of PrTi2Al20 and PrV2Al20 systems. Here the local moments at Pr sites carry quadrupolar and octupolar moments. I will present a general Landau theory for the multipolar ordering in such systems. Further, I will explain how magnetostriction, the length change of the system upon the application of external magnetic field, can be used as a power tool to detect multipolar ordering.

If time permits, I will also describe recent theoretical progress in understanding the multipolar Kondo problem, where new renormalization group fixed points may be found.

(Published on: Thursday December 6th, 2018)